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a
Ca2+ or Mg2+ ions in zeolite are replaced by Na+ions in hard water
b
Ca2+ ions in zeolite are replaced by Mg2+ ions in hard water
c
Na+ions in zeolite are replaced by Ca2+ and Mg2+ ions in hard water
d
None of the above
answer is C.
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Detailed Solution
Hard water contains chlorides, sulphates, carbonates and bicarbonates of Ca2+ and Mg2+. When water softening takes place, Ca2+ or Mg2+ ions are replaced by Na+ ions present in zeolite.